I too am a collector, & a shooter... but I don't have my book handy to run the serial... you do have the target grips ( which are later ) but those could have easily been switched out at any time, since they often broke, after they got brittle...

1st guess would be a smokeless gun, but someone really needs to run the serial to be sure...

I load about 3 levels of 32 S&W, ranging from soft lead roundballs & a pinch of powder ( to test for function ) to target loads with cast bullets, & hotter ( S&W only ) loads, as I actually carry an old top break spur trigger single action once in a while for nostalgia